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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/23992

Title: Identification of dynamic forces using group-sparsity in frequency domain
Authors: Rezayat, Ali
Nassiri, Vahid
De Pauw, Ben
Ertveldt, Julien
Vanlanduit, Steve
Guillaume, Patrick
Issue Date: 2016
Citation: MECHANICAL SYSTEMS AND SIGNAL PROCESSING, 70-71, p. 756-768
Abstract: The knowledge of acting dynamic forces is required for the design of structures. Given the structural model, inverse techniques offer the possibility to reconstruct the system’s input forces from vibration data. The inverse problem is highly sensitive to measurement noise, and the classical pseudo-inverse method generally fails to find the correct loads. In this paper we propose a new penalty function that combines the advantages of the ℓp-norm properties, together with a modified iterative optimization technique. The new algorithm (G-FISTA) is used to localize and reconstruct dynamic point-forces on a beam structure, with no prior knowledge on the force locations. The algorithm is validated by means of several simulations and experiments. The strain data is measured using Fiber Bragg Gratings (FBG) attached to the beam. The obtained results show that the location and time history of point forces are better estimated using the proposed technique.
URI: http://hdl.handle.net/1942/23992
DOI: 10.1016/j.ymssp.2015.09.015
ISI #: 000366765500046
ISSN: 0888-3270
Category: A1
Type: Journal Contribution
Validation: ecoom, 2017
Appears in Collections: Research publications

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